<html>
	<head>
		<style>
			* {
				margin: 0;
				padding: 0;
				box-sizing: border-box;
			}

			body {
				background: black;
				padding: 10px;
			}

			.header {
				background: red;
				height: 20px;
				width: 100%
			}

			.content {
				background: white;
				height: 500px;
				width: 100%;
			}
		</style>
	</head>
	<body>
		<div class="header"></div>
		<div class="content"></div>
	</body>
</html>
